Britain says new checks will be carried out across the car industry to ensure that a pollution test cheating scandal at German manufacturer Volkswagen is not repeated.
"The Vehicle Certification Agency, the UK regulator, is working with vehicle manufacturers to ensure that this issue is not industry-wide," said Transport Secretary Patrick McLoughlin in a statement.
"As part of this work, they will re-run laboratory tests where necessary and compare them against real world driving emissions."
McLoughlin added that Britain's government "takes the unacceptable actions at VW extremely seriously" and was backing a Europe-wide investigation.
The scandal broke last week after it emerged that VW fitted up to 11 million of its diesel cars with devices capable of fooling emissions tests.
Authorities in the US, France and South Korea have announced investigations and the company's chief executive Martin Winterkorn resigned on Wednesday (local time).
On Thursday, shares in fellow German carmaker BMW fell nearly 10 percent at one point after the weekly Auto Bild reported that emissions from one of its diesel models were 11 times higher than EU norms.
BMW denies cheating in pollution tests.